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-rw-r--r--include/linux/quota.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/quota.h b/include/linux/quota.h
index 9dfb6bce8c9e..1db16ee39b31 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -179,6 +179,16 @@ static inline struct kqid make_kqid_projid(kprojid_t projid)
return kqid;
}
+/**
+ * qid_has_mapping - Report if a qid maps into a user namespace.
+ * @ns: The user namespace to see if a value maps into.
+ * @qid: The kernel internal quota identifier to test.
+ */
+static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid)
+{
+ return from_kqid(ns, qid) != (qid_t) -1;
+}
+
extern spinlock_t dq_data_lock;